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KVM: ia64: Fix irq disabling leak in error handling code 

There is a call to local_irq_restore in the normal exit case, so it would
seem that there should be one on an error return as well.

The semantic patch that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression l;
expression E,E1,E2;
@@

local_irq_save(l);
... when != local_irq_restore(l)
    when != spin_unlock_irqrestore(E,l)
    when any
    when strict
(
if (...) { ... when != local_irq_restore(l)
               when != spin_unlock_irqrestore(E1,l)
+   local_irq_restore(l);
    return ...;
}
|
if (...)
+   {local_irq_restore(l);
    return ...;
+   }
|
spin_unlock_irqrestore(E2,l);
|
local_irq_restore(l);
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Julia Lawall 2008-07-22 21:38:18 +02:00 committed by Avi Kivity
parent 5fdbcb9dd1
commit cab7a1eeeb
1 changed files with 3 additions and 2 deletions
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5
arch/ia64/kvm/kvm-ia64.c
View File

@ -125,9 +125,9 @@ void kvm_arch_hardware_enable(void *garbage)
PAGE_KERNEL));
local_irq_save(saved_psr);
slot = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT);
local_irq_restore(saved_psr);
if (slot < 0)
return;
local_irq_restore(saved_psr);
spin_lock(&vp_lock);
status = ia64_pal_vp_init_env(kvm_vsa_base ?
@ -160,9 +160,9 @@ void kvm_arch_hardware_disable(void *garbage)
local_irq_save(saved_psr);
slot = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT);
local_irq_restore(saved_psr);
if (slot < 0)
return;
local_irq_restore(saved_psr);
status = ia64_pal_vp_exit_env(host_iva);
if (status)
@ -1253,6 +1253,7 @@ static int vti_vcpu_setup(struct kvm_vcpu *vcpu, int id)
uninit:
kvm_vcpu_uninit(vcpu);
fail:
local_irq_restore(psr);
return r;
}